CS5231-3GDPR5 datasheet(9/11 Pages) CHERRY

9 / 11 page

PC board by soldering both tab and leads will provide

superior performance with no PC board area penalty.

Description

The CS5231-3 application circuit has been implemented as

shown in the following pages. The schematic, bill of mate-

rials and printed circuit board artwork can be used to build

the circuit. The design is very simple and consists of two

capacitors, a p-channel FET and the CS5231-3. Five turret

pins are provided for connection of supplies, meters, oscil-

loscope probes and loads. The CS5231-3 power supply

management solution is implemented in an area less than

1.5 square inches. Due to the simplicity of the design, out-

put current must be derated if the CS5231-3 is operated at

VIN voltages greater than 7V. Figure 15 provides the derat-

ing curve on a maximum power dissipation if heatsink is

added. Operating at higher power dissipation without

heatsink may result in a thermal shutdown condition.

Figure 6: Demo Board Output Current Derating vs VIN

The VIN Connection

The VIN connection is denoted as such on the PC board.

The maximum input voltage to the IC is 14V before dam-

age to the IC is possible. However, the specification range

for the IC is 4.75V < VIN < 6V.

The Gnd Connection

The Gnd connection ties the IC power return to two turret

pins. The extra turret pin provides for connection of multi-

ple instrument grounds to the demonstration board.

The AuxDrv Connection

The AuxDrv lead of the CS5231-3 is connected to the gate

of the external PFET. This connection is also brought to a

turret pin to allow easy connection of an oscilloscope probe

for viewing the AuxDrv waveforms.

The VAUX Connection

The VAUX turret pin provides a connection point between

an external 3.3V supply and the PFET drain.

The VOUT Connection

The VOUT connection is tied to the VOUT lead of the

CS5231-3 and the PFET source. This point provides a con-

venient point at which some type of lead may be applied.

Application Circuit Schematic

PC Board Layout Artwork

The PC board is a single layer copper design. The layout

artwork is reproduced at actual size below.

Top Copper Layer

Top Silk Screen Layer

AUX.DRV

AUX3.3V

VOUT 3.3V

GND

VIN 5V

1.5"

VIN TP1

GND

TP2

TP3

TP5

TP6

AUXDRV

VIN

GND

AUXDRV

VOUT

CS5231-3

TP4

+3.3V VAUX

600

500

400

300

200

100

VIN(VOLTS)

Application Circuit Characteristics

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